<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root"></div>
    <script src="https://unpkg.com/react@18/umd/react.development.js" crossorigin></script>
    <script src="https://unpkg.com/react-dom@18/umd/react-dom.development.js" crossorigin></script>
    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <script type="text/babel">
        class MyComponent extends React.Component{
            constructor(props){
                super(props);
                this.state = {count:0};
                this.cnt = 0;
            }
            handleClick = () => {
                this.cnt++;
                console.log(this.cnt)
                // this.setState({
                //     count:this.state.count + 1
                // })
            }
            render(){
                return <div>
                        计数器：{this.state.count},{this.cnt}
                        <input type="button" value="ok" onClick={this.handleClick} />
                    </div>
            }
        }

        ReactDOM.createRoot(document.getElementById("root")).render(<MyComponent />);
    </script>
</body>
</html>